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bd7143e6eb
Various warnings revealed by configurations added to the tested configurations in libpng 1.6 need corresponding fixes in libpng 1.5. This takes the libpng 1.6 pngvalid.c and adds it back to libpng 1.5, however one write-only test is currently disabled because it does not work; possibly because of failures to reset or initialize the deflate stream correctly in write-only cases.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library.